Brake



April 1 1924.

D. 1. GEROW BRAKE Filed Nov. 11 1922 3 Sheets-Sheet 1 III "III/I'll,III/II? l er INVENTOR ATTO RN EY WITNESSES April 1 1924. I 1,489,203

D. l. GEROW BRAKE Filed Nov. 11, 1.922 3 Sheets-Sheet INVENTOR fla/Zrw mo I AIITORN EY WITNESSES D. l. GEROW BRAKE April 1 1924. 1,489,203

Filed Nov. 11 1922 s Sheets-Sheet U] I zzzalmw j. 1. Eerow WITNESSESPatented Apr. ll, 14.924.

unrr stars rarest nneirn.

Application filed November 11, 1922. Serial No. 600,383.

To all whom it may concern:

Be it known that I, DONALD l. Gnnow, a subject of King George V of GreatBritain, residing at Buffalo, infithe county of Erie and State of NewYork, have invented new and useful Improvements in Brakes, of which thefollowing is a specification.

This invention relates to a brake for motor vehicles, and the like, thegeneral object of the invention being to provide fluid circulating meanswhich are connected with the drive wheels of the vehicle with means forpreventing the circulation of fluid when it is desired to stop thevehicle.

Another object of the invention is to provide relief means forpreventing injury to the parts under unusual conditions.

This invention also consists in certain other features of constructionand in the combination and arrangement of the several parts, to behereinafter fully described, illustrated in the accompanying drawingsand specificallypointed out in the appended claims. v

In describing my invention in detail, reference will be had to theaccompanying drawings wherein like characters denote like orcorresponding parts throughout the several views, and in which Figure 1is a rear view of a motor vehicle showing my invention in use.

Figure 2 is a plan view with parts broken awa Figure 3 is a section online 3-3 of Figure 2.

Figure 4 is a section on line iti of Figure 3.

Figure 5 is a sectional view through the eccentric.

Figure 6 is a detail view partly in section of the eccentric strap and apart of the piston rod.

Figure 7 is a sectional view showing a double acting pump.

Figure 8 is a section on line 8-8 of Figure 2.

In these views 1 indicates the rear axle housing of a motor vehicle, 2the drive shafts to which the rear wheels 3 are connected. in carryingout my invention I lace cam housings 4: at each end of the iiousing 1and connect a pump cylinder 5 to each housing a. A cam d is secured toeach drive shaft 2 and this cam is connected by the rod 7 with thepiston 8 in the cylinder. Thus the rotary movement of the drive shaftswill reciprocate the pistons. A screened inlet 9 is connected with eachcylinder, each inlet having a valve 10 therein for reventing the exhaustof air throu h the in ct on the compression stroke of t e piston. Thevalved outlet 11 of each cylinder is connected by a pipe 12 to a commonoutlet valve 13 which is normally held open by a spring 14 engaging thearm 15 of the valve. A foot pedal 16 is laced adjacent the drivers seatand this pe -al is connected by the rod 17 with the arm 15 so that whenthe pedal is depressed the valve will be closed. An emergency valve 18is connected with each pump cylinder to prevent damage to the partsthrough careless use. These valves are set to a load sufficient to stopa car.

From the above it will be seen that when the car is traveling along thepistons of the pumps will be reciprocated through the action of thedrive shafts. Air will be sucked in through the inlets 9 and exhaustthrough the valve 13 so that the motor vehicle will not be affected bythe device. When it is desired to stop the vehicle, however, the footpedal is depressed to close or partly close the valve 13, thuspreventing the circulation of air by the pumps and the pressure of thetrapped air will act as a brake to'the pistons of the pumps and thuscheck the rotation of the shafts.

Figure 7 shows a double acting pump wherein the cylinder 5 is providedwith a pair of inlet valves 5 and a pair of outlet valves 5 which are soarranged that the piston will draw in air and exhaust it at each stroke.

It is thought from the foregoin description that the advantages and movefeatures of my invention will be readily apparent.

I desire it to be understood that I may make changes in the constructionand in the combination and arrangement of the several arts, providedthat such changes fall wit in the scope of the appended claims.

What 1 claim is 1. in a motor vehicle, a air of housings connected withthe rear an e housing thereof, a cam in each housing and connected tillwith the drive shaft, a pump cylinder connected with each housing, acylinder in each pump, a rod connecting the same w th the cam, anexhaust valve, pipes connecting the pump cylinders with said valve,inlet means Mil for each cylinder, a relief valve for each cylinder andmanually operated means for closing the exhaust valve.

2. In a motor vehicle, a housing connected with a. part thereof, acylinder connected with the housing, a cam in the housing and attachedto a rotatable part of the vehicle, a piston in the cylinder, aconnecting rod actuating the exhaust valve and inlet means for thecylinder.

In testimony whereof I afiixmy signature.

DONALD ,1; GEROW.

